Seam
One schema file. Python, Node and the browser agree.
Details
- External ID
- 1242240
- Source
- PH
- Company
- —
- Product
- SeamUI
- Website domain
- producthunt.com
- Launched
- Sept. 6, 2026
- Cohort
- —
- Upvotes
- 2
- Upvotes percentile
- 0.7405388069275176
- Tags
- Productivity, Open Source, GitHub, Development Language
- Fetched at
- Sept. 6, 2026, 6:35 p.m.
- Updated at
- Sept. 6, 2026, 6:35 p.m.
Description
Every language has a good validator. The bugs are not inside a language, they are at the seam between two, where each disagrees about what the data means. JavaScript loses integers past 2^53. Python cannot tell absent from null. Seam makes the contract a file. Python, Node and the browser validate against the same compiled Rust engine, not the same spec written three times. 95 conformance cases run from all four in CI, so agreement is tested. pip install seam-schema npm install seam-schema
Enrichment
- Theme
- niche developer utilities and toolchains
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- schema definition tool for multiple programming languages
- Manually corrected
- False
Could you build this?
Partial Designing a compiler or code generator that transpiles a single custom schema DSL into idiomatic, edge-case-safe validation logic across Python, Node, and browsers requires formal language design and compiler experience.
What it would actually take: Requires designing a cross-platform schema specification, lexer, parser, and code generators (e.g., in Rust or TypeScript) targeting Python (Pydantic/dataclasses) and TypeScript/JS (Zod/TypeBox). The hard part is handling platform-specific numerical precision boundaries (IEEE 754 64-bit float limitations in JS vs arbitrary precision integers in Python) and nullability semantics consistently across language runtimes.
Competitors
Other products that read as similar to this one — 42 launches clear the similarity bar, closest 8 shown.
Attention rank: #11 of 43 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 301 days after the earliest competitor.
- Titan · hn · 2025-12-11 · 49 upvotes · similarity 0.40
- json-toolkit · github · 2026-09-29 · 64 upvotes · similarity 0.39
- JSON Object Validator · ph · 2026-09-24 · 2 upvotes · similarity 0.39
- Prisma Next · hn · 2026-05-22 · 13 upvotes · similarity 0.39
- parquet-schema-check · github · 2026-09-25 · 20 upvotes · similarity 0.38
- SIGMA PROOFKIT · ph · 2026-09-26 · 1 upvotes · similarity 0.38
- HTTP/3 and raw QUIC client/server APIs for Node.js · hn · 2026-06-08 · 16 upvotes · similarity 0.38
- ISON · hn · 2025-12-26 · 7 upvotes · similarity 0.37
Other launches for this product
Same idea, different domain
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